Languages · Language engineering
Code-Switching in Indian Voice AI Calls
Understand why callers mix Indian languages with English and how to design, test and measure voice AI for code-switched conversations.
Why customers switch languages
A caller may use an Indian language for conversation and English for a product name, job title, address fragment or technical term. They may also switch when quoting a message or speaking to another person nearby.
Forcing one language can increase friction and errors. The agent should keep the conversation coherent without commenting on every switch.
Design terminology before launch
Collect real phrases from consented or appropriately governed call reviews and frontline teams. Build a list of words that should remain in English, approved transliterations and ambiguous terms that need clarification.
- Product, plan and company names.
- Addresses, landmarks and city abbreviations.
- Money, dates, times and measurement units.
- Technical support vocabulary.
- Common intent phrases and polite corrections.
Test combinations, not languages alone
A system may perform well in Hindi and English separately but fail on mixed sentences. Create test cases that switch at different points and include numbers or named entities immediately after the switch.
Run the calls through the actual telephone route. Studio microphones do not reproduce compression, packet loss, speakerphone echo or road noise.
Measure semantic success
Track intent, entities, confirmed values, action completion and language-related transfers. Review whether the agent preserved the customer's meaning rather than merely matching each word.
When the agent is uncertain, a concise clarification is better than guessing. Repeated uncertainty should trigger a supported-language handoff or follow-up.
Frequently asked questions
What is code-switching in a voice call?
It is the natural movement between two or more languages within a conversation or sentence, such as Hindi and English.
Why is code-switching difficult for voice AI?
Recognition and pronunciation can degrade at language boundaries, especially around names, numbers and domain-specific terms.
How should code-switching be tested?
Use real mixed-language phrases, diverse speakers and actual phone audio, then score meaning, critical values and completed actions.